maps_vs_records.erl

%% Map keys known at compile-time
%% No boilerplate code or parse transform for record -> JSON
%% Matching on map keys in function signatures, not possible with proplists
%% JSONFrags = [#{...}, #{...}, #{...},

process_layers(JSONFrags) -> process_layers(JSONFrags, #{}).

process_layers([], Result) ->
  jsx:encode(Result).
process_layers([#{<<"key">> := <<"value">>} | Rest], Result) ->
  process_layers(Rest, Result{<<"new_name">> => <<"Value">>});
process_layers([#{<<"key2">> := <<"value2">>} | Rest], #{<<"key3">> := _} = Result) ->
  process_layers(Rest, Result);
process_layers([#{<<"key2">> := <<"value2">>} = Layer | Rest], Result) ->
  [<<"Name">>, <<"Label">>, <<"Type">>] = maps:get(<<"Columns">>,Layer),
  [[Name, _Label, _Type]] = maps:get(<<"Rows">>,Layer),
  process_layers(Rest, Result#{<<"new_name">> => Name}).